Reamer.



PATENTED DEC. 3, 1907. P. W. LETSGH.

REAMER APPLICATION FILED JAN, 3,}906.

FAiTiEihlT @FFTQEQ.

FREDERICK W. LETSOH, OF BALTIMORE, MARYLAND, ASSIGNOR TO OTTi MERGENTHALER OOMPANY,'OF BALTIMORE, MARYLAND, A CORPORATION OF DELAWARE.

REAlliER.

Specification of Letters Patent.

Patented Dec. 3, 1907.

Application filed January 3 1906- fierial No. 294.483.

Baltimore, Maryland, have invented certain new and useful. Improvements in Reamers, of which the iollowing is specification.

This invention relates to nnprovements in rotary cutting tools and more especially to.

improvements in an expanding reainer.

The invention will be described in connection with the accompanying rawing, in which,

Figure 1 is a side elevation of an expanding reamer embodying the invention; Fig. 2 is central sectional view of the same; Fig. 3 is a partial section on the line 3-3 of Fig. 2; and Fig. 4 is a side View of one of the cutters.

Referring to the drawing, 1 indicates the body of the reamer which is cylindrical and provided on its periphery with a series of ion gitudinal grooves 2 having inclined seats 3 for the cutters a. Each of the cutters has a cutting edge 4 which is substantially parallel with the axis of the reamer body and a base 5 having the same inclination as the seat 3 upon which the base rests. The base of the cutter is thicker than its cutting edge and along its forward face is a beveled shoulder 6 which is parallel with the cutting edge 4 and a beveled shoulder 6 at the largcrendof the cutter wvhic-h connects with the shoulder 6 and is inclined away from the cuttingedge preferably an angle greater than the angle between the inclined seats and the axis of the body.

Each of the cutters is clamped to its seat in the reamcr by a series of screws 7 having heads which are constructed with conical portions 8 adapted to engage the shoulders 6, 6'" and cylindrical portions 9 which are adapted to engage and bear upon the wall of the groove 2 opposite the cutter. As shown, there are two screws to each cutter but addi; tional screws may be used if desired. One oi the screws of each series is arranged to coiipcrate with the inclined shoulder 6 to prevent the cutter from moving toward the i'orward or outer end of the reamer, as shown in Fig. 2. It will be evident that when the screw is turned down tightly upon the shoulder 6, the cutter will be locked positively against endwise movement toward the forward end of the reamer.

By adjusting the cutters longitudinally in the slots 2 the diameter of the circle drawn through. the

or diminished.

cutting edges may be increased I provide means for un1- formly adjusting the several cutters as follows: Upon the rear end of the body is a rotatable ring or sleeve 10 havin a series of inclines 1 1 on its forward ed incline to each cutter.

"e, t ere being one The rear ends 12 of the cutters are preferably beveled to correspond to inclines.

The ring 10 is on a reduced port-ion of the body and the teeth 13 formed by the inclines are adapted to engage and be clamped against the shoulder 14 separating the reduced portion from the main part of the body. In the rear of the toothed ring 10 is, a clamping ring 15 which is threaded upon the body and adapted to sition.

clamp the toothed ring 10 in any desired p0- When it is desired to change the cutting diameter of the reamer, the ring 15 is turned back slightly to release the toothed ring 10 and the screws 7 are loosened.

ring 10 is th The toothed en turned one way or the other as may be desired and reclamped against the shoulder 14. against the 1 by the screws.

The cutters are then moved nclmes and fastened in position By turning down the for-- ward screw first upon the incline'6, the cutter 'ill be held securely against its incline as the tendency of the incline 6 is to iorcc the cutter reerw ard The reaiucr above described is simple in construction build. The

and comparatively cheap to cutters may be ad usted quickly role ' cutters.

Having described my invention what I claim and desire to secure by Letters Patent 1. In a rotarycuttingtool, the combination with a cylindrical body having longitudinal groove s in. its outer surface, of cutters seated in said grooves, and screws for clamping thc'cuttcrs in position, each cutter having a shoulder parallel with'its cutting edge, and a second shoulder inclined to its cutting edge, the screws bearing against said shoulders to clam forth.

p the cutters in position, as set of cutters having inclined bases adapted to said seats, each cutter having a clamping shoulder substantially parallel to itscutting edge and a shoulder inclined away from the cutting edge at an angle greater than the angle between inclined seats and the axis of the body, and screws adapted to bear on said shoulders to clamp the cutter to its seat.

'3. In a rotary cutting tool, the combina tion with a body having longitudinal grooves in its periphery and inclined seats at the bottom of the grooves, of cutters having inclined bases adapted to be seated in said grooves and adjustable lengthwisc'therein, means for clamping the cutters on said seats and arotatable ring on said body having a series'of inclines on its forward 1 edge adapted to cooperate with the rear ends of the cutters, for the purpose set forth.

4. In a rotary cutting tool, the combination with a body having lcngitudinalgrooves in its periphery, of cutters seated in said grooves, a ring upon a reduced portion of the body and having a series of teeth adapted to he clamped against the shoulder separating said reduced portion from the main. portion cfthe body, inclines on said teeth cooperate ing with the cutters, and means for clamping evepaa having inclinesadapted to bear against the narrower ends of said cutters;antl rneans for locking said ring in any desired position,

whereby the cutters arepositiv'elylocked against endwise movement In either direc tion. 1. l

6. A cutter for a rotary cutting tool having a cutting edge, a base inclined to said cutting edge, a clampingshoulder substantially arallel' to the cuttingedge and a second shoulder inclinedto said cutting edge, for the purpose set forth.

In testimony whereof I aflisr my signature in presence of two witnesses.

' FREDERICK W. LETSQH.

Witnesses:

EMIL R. DENHARD, B. C. Rnsr. 

